Question # 1

Which one of the following is brittle?

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Sodium

Aluminum

Selenium

Magnesium

The most abundant element occurring in the oceans is:

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Oxygen

Hydrogen

Nitrogen

Silicon

________________ elements were discovered in year 1800.

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34

35

36

37

Intermolecular forces are of three types and are collectively called ____________

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Nelson' forces

Vander Waal's forces

Neurons

Nil

Pure alkali metals can be cut simply by knife but iron cannot because of alkali metals have:

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Strong metallic bonding.

Weak metallic bonding

Non- metallic bonding

Moderate metallic bonding

A _________ is a pure substance is made up of two or more elements.

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Mixture

Elements

Solution

Compound

Nelson's cells used to prepare caustic soda along with gases. Which of the following gas is produced at cathode?

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CI₂

H₂

O₃

O₂

Sodium - potassium alloy is used in nuclear reactor as a:

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catalyst

coolant

reactant

absorber

Which of following does not belong to p-block?

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IIIA

IVA

VA

VIB

_____________ revolves in orbits around nucleus.

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Electron

Proton

Neutrons

Nil

The practical unit of concentration is

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%v/v

%v/m

%m/m

M

Copper extracted from its ore is ____________ % pure.

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98%

99%

96%

Nil

_________ elements naturally occurring.

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92

118

93

117

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